/*
 * Copyright 2024 LinQingYing. and contributors.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 *
 * The use of this source code is governed by the Apache License 2.0,
 * which allows users to freely use, modify, and distribute the code,
 * provided they adhere to the terms of the license.
 *
 * The software is provided "as-is", and the authors are not responsible for
 * any damages or issues arising from its use.
 *
 */

package org.cangnova.cangjie.psi.typeRefHelpers

import org.cangnova.cangjie.lexer.CjTokens
import org.cangnova.cangjie.psi.*
import org.cangnova.cangjie.psi.psiUtil.parentsWithSelf
import org.cangnova.cangjie.psi.psiUtil.siblings

fun CjFunctionType.setReceiverTypeReference(typeRef: CjTypeReference?) =
    doSetReceiverTypeReference(
        typeRef,
        { receiverTypeReference },
        {
            (
                addBefore(
                    CjPsiFactory(project).createFunctionTypeReceiver(it),
                    parameterList ?: firstChild,
                ) as CjFunctionTypeReceiver
                ).typeReference
        },
    )
fun CjCallableDeclaration.setReceiverTypeReference(typeRef: CjTypeReference?) =
    doSetReceiverTypeReference(
        typeRef,
        { receiverTypeReference },
        { this.addBefore(it, nameIdentifier ?: valueParameterList) as CjTypeReference },
    )

private inline fun <T : CjElement> T.doSetReceiverTypeReference(
    typeRef: CjTypeReference?,
    getReceiverTypeReference: T.() -> CjTypeReference?,
    addReceiverTypeReference: T.(typeRef: CjTypeReference) -> CjTypeReference,
): CjTypeReference? {
    val needParentheses = typeRef != null && typeRef.typeElement is CjFunctionType && !typeRef.hasParentheses()
    val oldTypeRef = getReceiverTypeReference()
    if (typeRef != null) {
        val newTypeRef =
            if (oldTypeRef != null) {
                oldTypeRef.replace(typeRef) as CjTypeReference
            } else {
                val newTypeRef = addReceiverTypeReference(typeRef)
                addAfter(CjPsiFactory(project).createDot(), newTypeRef.parentsWithSelf.first { it.parent == this })
                newTypeRef
            }
        if (needParentheses) {
            val argList = CjPsiFactory(project).createCallArguments("()")
            newTypeRef.addBefore(argList.leftParenthesis!!, newTypeRef.firstChild)
            newTypeRef.add(argList.rightParenthesis!!)
        }
        return newTypeRef
    } else {
        if (oldTypeRef != null) {
            val dotSibling = oldTypeRef.parent as? CjFunctionTypeReceiver ?: oldTypeRef
            val dot = dotSibling.siblings(forward = true).firstOrNull { it.node.elementType == CjTokens.DOT }
            deleteChildRange(dotSibling, dot ?: dotSibling)
        }
        return null
    }
}
